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Fearow, Moltres, and (one that hasn't been mentioned yet) Blaziken. Fearow appears to have a similar wing span and beak length (at least in proportion to its overall size), Moltres shares its typing, and Blaziken is (sort of) a chicken that uses fire, and chickens are a type of bird.
Moltres reminds me of Ho-Oh but only more fierce looking. They're both based on Phoenixes.
...I just thought of a poke shipping.xD; Just like Articuno x Lugia, I just thought of Moltres x Ho-Oh.xDDD
Spearow, Fearow, and Moltres. When I was little, I thought that it was Spearow - Fearow - Moltres - Ho-oh. I thought they were an evolution chain that GameFreak didn't want us to know about.